Receiver Problems

Have several strange issues with receiver.. Receiver will lock up occasionally and has to be unplugged and powered back up and run through setup to clear. Seems to happen most often when viewing Netscape.2. Receiver will occasionally restart for no reason. Has plenty of cooling, plugged into UPS. No problem with UPS.3. When signal is lost after severe storm and the signal is restored, the resolution on my TV is changed from 16.9, 1080 to a square or letterbox format and I cannot reset the receiver to the 16.9, 1080 resolution. I can get it to letterbox format. The next day; however, it will turn on with the 1080 resolution without me making any changes.